Possible Ambiguity in Translation of Group Graph Patterns from Jesse Weaver on 2013-04-22 (public-sparql-dev@w3.org from April to June 2013) (original) (raw)

Public SPARQL Dev mailing list,

In section 18.2.2.6 of the W3C Recommendation of SPARQL 1.1<http://www.w3.org/TR/sparql11-query/#sparqlTranslateGraphPatterns>, there appears (to me) to be some ambiguity in the translation of group graph patterns. Specifically, in the pseudocode following "If the form is GroupGraphPattern", the third (non-blank) line says "For each element E in the GroupGraphPattern". No order seems to be explicitly given (unless I overlooked some mandate elsewhere in the recommendation), yet the order seems to be significant since each iteration of the loop builds on the G from the previous iteration. Could someone please provide some clarity on the matter or point out my misunderstanding?

Thank you.

-Jesse Weaver